<template>
  <div class="gongqiPie" ref="gongqiPie"></div>
</template>

<script>
import * as echarts from 'echarts'
import 'echarts-gl'
export default {
  name: 'PieChart',
  data() {
    return {}
  },
  props: {
    optionsData: {
      type: Array,
      default: () => []
    }
  },
  watch: {
    optionsData: function (newValue) {
      console.log(newValue)
    }
  },
  mounted() {
    this.renderBarChart()
  },
  methods: {
    renderBarChart() {
      let myChart = echarts.init(this.$refs.gongqiPie)
      function getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, height) {
        // 计算
        let midRatio = (startRatio + endRatio) / 2

        let startRadian = startRatio * Math.PI * 2
        let endRadian = endRatio * Math.PI * 2
        let midRadian = midRatio * Math.PI * 2

        // 如果只有一个扇形，则不实现选中效果。
        if (startRatio === 0 && endRatio === 1) {
          isSelected = false
        }

        // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
        k = typeof k !== 'undefined' ? k : 1 / 3

        // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
        let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0
        let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0

        // 计算高亮效果的放大比例（未高亮，则比例为 1）
        let hoverRate = isHovered ? 1.05 : 1

        // 返回曲面参数方程
        return {
          u: {
            min: -Math.PI,
            max: Math.PI * 3,
            step: Math.PI / 32
          },

          v: {
            min: 0,
            max: Math.PI * 2,
            step: Math.PI / 20
          },

          x: function (u, v) {
            if (u < startRadian) {
              return offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
            }
            if (u > endRadian) {
              return offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
            }
            return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate
          },

          y: function (u, v) {
            if (u < startRadian) {
              return offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
            }
            if (u > endRadian) {
              return offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
            }
            return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate
          },

          z: function (u, v) {
            if (u < -Math.PI * 0.5) {
              return Math.sin(u)
            }
            if (u > Math.PI * 2.5) {
              return Math.sin(u)
            }
            return Math.sin(v) > 0 ? 1 * height : -1
          }
        }
      }
      // 生成模拟 3D 饼图的配置项
      function getPie3D(pieData, internalDiameterRatio) {
        let series = []
        let sumValue = 0
        let startValue = 0
        let endValue = 0
        let legendData = []
        let k =
          typeof internalDiameterRatio !== 'undefined'
            ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
            : 1 / 3

        // 为每一个饼图数据，生成一个 series-surface 配置
        for (let i = 0; i < pieData.length; i++) {
          sumValue += pieData[i].value
          let seriesItem = {
            name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
            type: 'surface',
            parametric: true,
            wireframe: {
              show: false
            },
            pieData: pieData[i],
            pieStatus: {
              selected: false,
              hovered: false,
              k: k
            }
          }

          if (typeof pieData[i].itemStyle != 'undefined') {
            let itemStyle = {}

            typeof pieData[i].itemStyle.color != 'undefined' ? (itemStyle.color = pieData[i].itemStyle.color) : null
            typeof pieData[i].itemStyle.opacity != 'undefined'
              ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
              : null

            seriesItem.itemStyle = itemStyle
          }
          series.push(seriesItem)
        }
        // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
        // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
        for (let i = 0; i < series.length; i++) {
          endValue = startValue + series[i].pieData.value
          series[i].pieData.startRatio = startValue / sumValue
          series[i].pieData.endRatio = endValue / sumValue
          series[i].parametricEquation = getParametricEquation(
            series[i].pieData.startRatio,
            series[i].pieData.endRatio,
            false,
            false,
            k,
            series[i].pieData.value
          )

          startValue = endValue

          legendData.push(series[i].name)
        }
        return series
      }
      // 传入数据生成 option
      const series = getPie3D(this.optionsData, 0.8, 240, 28, 26, 0.5)
      series.push({
        name: 'pie2d',
        type: 'pie',
        label: {
          show: false,
          opacity: 1,
          fontSize: 14,
          lineHeight: 20,
          textStyle: {
            fontSize: 14,
            color: '#fff'
          }
        },
        labelLine: {
          length: 30,
          length2: 30
        },
        startAngle: -30, //起始角度，支持范围[0, 360]。
        clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
        radius: ['40%', '60%'],
        center: ['50%', '50%'],
        data: this.optionsData,
        itemStyle: {
          opacity: 0
        }
      })
      // 准备待返回的配置项，把准备好的 legendData、series 传入。
      let option = {
        legend: {
          show: false,
          tooltip: {
            show: true
          },
          orient: 'vertical',
          data: this.optionsData.map((item) => item.name),
          top: 'center',
          itemGap: 14,
          itemHeight: 8,
          itemWidth: 17,
          right: '2%',
          textStyle: {
            color: '#fff',
            fontSize: 12
          }
        },
        animation: true,
        tooltip: {
          formatter: (params) => {
            if (params.seriesName !== 'mouseoutSeries' && params.seriesName !== 'pie2d') {
              return `${
                params.seriesName
              }<br/><span style='display:inline-blockmargin-right:5pxborder-radius:10pxwidth:10pxheight:10px;background-color:${
                params.color
              }'>&nbsp</span>${option.series[params.seriesIndex].pieData.value + '个'}`
            }
          },
          backgroundColor: () => {
            return 'red'
          },
          textStyle: {
            fontSize: 14
          }
        },
        title: {
          x: 'center',
          top: '20',
          textStyle: {
            color: '#fff',
            fontSize: 22
          }
        },
        labelLine: {
          show: false,
          lineStyle: {
            color: '#7BC0CB'
          },
          normal: {
            show: false,
            length: 10,
            length2: 10
          }
        },
        label: {
          show: false
        },
        xAxis3D: {
          min: -1,
          max: 1
        },
        yAxis3D: {
          min: -1,
          max: 1
        },
        zAxis3D: {
          min: -1,
          max: 1
        },
        grid3D: {
          show: false,
          boxHeight: 1, //立柱的高度
          //top: '30%',
          bottom: '50%',
          // environment: 'rgba(255,255,255,0)',
          viewControl: {
            distance: 180, //圆环大小
            alpha: 25, //倾斜角度
            beta: 60,
            autoRotate: true // 自动旋转
          }
        },
        series: series
      }
      myChart.setOption(option)
    }
  }
}
</script>

<style scoped lang="scss">
.gongqiPie {
  width: 200px;
  height: 200px;
}
</style>
